Cards Against Humanity is distributed under a Creative Commons BY-NC-SA 2.0 license.
That means you can use and remix the game for free,
but you can't sell it without Cards Against Humanity's permission.

The card game template is also free to download from Cards Against Humanity's website.

Cards Against Humanity was a Kickstarter project and the game is like Apples to Apples for adults.

Reviews:

Cards Against Humanity has obtained an average 4.9 out of 5 star rating from customers on Amazon.

Drawbacks:

This game is not for anyone who takes situations seriously all the time.

The game is definitely not for children.
We suggest to follow the manufacturer's age recommendation.